Slag phase treatment system for lateritic nickel ore leaching solution after iron-aluminum-chromium removal

Abstract

A slag phase treatment system for a lateritic nickel ore leaching solution after iron-aluminum-chromium removal, relating to the technical field of slag phase treatment for lateritic nickel ores. The system comprises a filter module (1), a refining module (2), a feed module (3), and a measurement module (4); the filter module (1) comprises a material suction assembly (11) and a filter assembly (12); the material suction assembly (11) is used for a slag phase precipitation area provided in a multi-section iron-aluminum-chromium removal unit (63), and a material suction port of the material suction assembly (11) is communicated with the slag phase precipitation area; the filter assembly (12) is connected to a discharge port of the material suction assembly (11); the filter assembly (12) is provided with a filter residue outlet, and a filtrate outlet connected to the multi-section iron-aluminum-chromium removal unit (63); the refining module (2) is connected to the filter residue outlet; the feed module (3) comprises a material pipe (31) and a material guide driving member (32); the material pipe (31) is provided with a feed end connected to a discharge port of the refining module (2); and the measurement module (4) is connected to the material guide driving member (32) and a circulating leaching pulp neutralizing unit (61). According to the system, a generated slag phase can be filtered out in time and refined, and returned filter residues are subjected to quantity control, so that the subsequent acid-leaching dissolution efficiency of the slag phase can be improved.

Description

A slag phase treatment system for laterite nickel ore leachate after iron, aluminum and chromium removal Technical Field

[0001] The invention relates to the technical field of laterite nickel ore slag phase treatment, in particular to a slag phase treatment system after iron, aluminum and chromium are removed from laterite nickel ore leaching solution. Background Art

[0002] Laterite nickel ore resources are surface weathering crust deposits formed by the weathering, leaching and deposition of nickel sulfide rock masses. The world's laterite nickel ores are distributed in tropical countries within 30 degrees north and south of the equator, and are concentrated in the tropical and subtropical regions around the Pacific Ocean, mainly in: Cuba and Brazil in the Americas; Indonesia and the Philippines in Southeast Asia; Australia, New Caledonia, Papua New Guinea in Oceania, etc.

[0003] After being processed, laterite nickel ore contains non-negligible nickel, chromium and manganese. Discarding it will cause huge losses of nickel, cobalt and manganese. Publication No. CN110331283B provides a method for treating laterite nickel ore acid leaching residue. After the first stage of iron and aluminum removal, calcium hydroxide is used to adjust the pH value of the first stage of iron and aluminum removal liquid to 4.2-4.5 for the second stage of iron and aluminum removal, thereby obtaining a second stage of iron and aluminum slag and a second stage of iron and aluminum removal liquid. The second stage of iron and aluminum removal liquid is subjected to nickel and cobalt precipitation to obtain a barren solution after nickel and cobalt precipitation and a nickel and cobalt precipitate. The barren solution after nickel and cobalt precipitation is subjected to manganese and magnesium precipitation in steps to obtain manganese slag and magnesium slag. Finally, the second stage of iron and aluminum slag is returned to the pressurized acid leaching process. In general, a circulating leaching slurry neutralization unit is used to neutralize the excess acid in the leachate, a multi-stage iron, aluminum and chromium removal unit is used to remove impurities from the liquid phase of the leachate, and the second stage and multi-stage slag phases produced in the multi-stage iron, aluminum and chromium removal unit are returned to the circulating leaching slurry neutralization unit for acid leaching again. However, the slag phase produced in the iron, aluminum and chromium removal process may have large particles, which is not conducive to reaction with acidic slurry during subsequent utilization, affecting the efficiency of slag phase recovery.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leachate, so as to solve the technical problem of low recovery efficiency of the slag phase generated in the iron, aluminum and chromium removal process in the prior art.

[0006] To achieve the above technical objectives, the technical solution of the present invention provides a slag phase processing system after iron, aluminum and chromium removal from laterite nickel ore leachate, comprising a filtering module, a refinement module, a feeding module and a measuring module. The filtering module comprises a suction component and a filtering component. The suction component is used to be arranged in a slag phase precipitation zone within a multi-stage iron removal aluminum and chromium unit, and its suction port is connected to the slag phase precipitation zone, and is used to extract the slag phase generated in the multi-stage iron removal aluminum and chromium unit. The filtering component is connected to the discharge port of the suction component and is used to filter the slag phase. The filtering component has a filter residue outlet and a filtrate outlet connected to the multi-stage iron removal aluminum and chromium unit; the refinement module is connected to the filter residue outlet and is used to crush the filter residue.

[0007] The suction component can suck out the slag phase produced in the multi-stage iron removal, aluminum and chromium removal unit, and introduce the slag phase into the filtration component. After solid-liquid separation through filtration by the filtration component, the sucked filtrate can be returned to the multi-stage iron removal, aluminum and chromium removal unit, and the filter residue is discharged to the refinement module and crushed by the refinement module.

[0008] The feeding module includes a material pipe and a material guide drive. The material pipe has a feeding end connected to the discharge port of the refinement module and a discharge end connected to the circulating leaching slurry neutralization unit. The material guide drive is built into the material pipe and is used to guide the slag phase into the circulating leaching slurry neutralization unit. The measuring module is connected to the material guide drive and the circulating leaching slurry neutralization unit and is used to obtain the pH value of the slurry in the circulating leaching slurry neutralization unit and control the material guide drive to stop feeding when the detected pH value reaches the set value.

[0009] The filter residue is crushed by the refining module and then introduced into the material pipe. The slag phase is sequentially guided into the circulating leaching slurry neutralization unit by the drive of the material guide drive. When the measurement module detects that the pH value of the circulating leaching slurry neutralization unit reaches the set value, the measurement module can trigger a signal to control the material guide drive to stop feeding, thereby realizing the regulation of the amount of slag phase input.

[0010] In some embodiments, the suction assembly includes a suction pipe and a suction pump. The suction pipe is arranged in the slag phase precipitation area in the multi-stage iron removal, aluminum removal and chromium removal unit, and multiple suction ports are evenly arranged on its lower side along its length; the inlet of the suction pump is connected to the suction pipe through a first connecting pipe, and the outlet is connected to the filter assembly through a second connecting pipe.

[0011] In some embodiments, the filter assembly includes an outer cylinder, an inner cylinder, a liquid collecting box, a first spiral conveying rod and a first motor, and the outer cylinder is arranged at an angle; the inner cylinder is embedded in the outer cylinder and is coaxially arranged with the outer cylinder, and a number of filter holes for filtering the liquid are evenly opened on the cylinder wall of the inner cylinder, the lower end of the inner cylinder is connected to the discharge port of the suction assembly, and the higher end is connected to the refinement module; the liquid collecting box is sleeved on the lower end of the outer cylinder, and a through port connected to the liquid collecting box is opened on the bottom side of the outer cylinder; the first spiral conveying rod is embedded in the inner cylinder and extends from the bottom end of the inner cylinder to the top end thereof; the driving shaft of the first motor is connected to the first spiral conveying rod to drive the first spiral conveying rod to rotate to transport the filter residue to the refinement module. This structure can fully filter the liquid mixed in the filter residue.

[0012] In some embodiments, the refinement module includes a kettle body, a crushing assembly and an abrasive assembly arranged in sequence below the feed port of the kettle body, the crushing assembly is used to crush the filter residue entering the feed port, and the abrasive assembly is used to grind the crushed filter residue; the crushing assembly includes two crushing rollers and a driving member, the two crushing rollers are arranged in parallel and meshed with each other for rotation, and a crushing area corresponding to the feed port of the kettle body and used to crush the filter residue is formed between the two crushing rollers; the driving member is connected to both crushing rollers to drive the two crushing rollers to rotate relative to each other; the middle of the outer wall of the kettle body is concave inward to form an inner The shrinking cylinder is located between the crushing assembly and the abrasive assembly, and its upper end is connected to the inner wall of the kettle body to form a shrinking channel with a cross-sectional area decreasing from top to bottom, and its lower end is connected to the inner wall of the kettle body to form an expansion channel with a cross-sectional area increasing from top to bottom; the abrasive assembly includes a grinding roller and a third motor, the grinding roller is built into the expansion channel, the outer peripheral surface of the grinding roller and the inner wall of the kettle body are arranged at an interval to form a grinding area therebetween, and the driving shaft of the third motor is connected to the grinding roller to drive the grinding roller to rotate so as to grind the filter residue passing through the grinding area.

[0013] In some embodiments, the material guide drive member includes a second spiral conveying rod and a second motor, and the second spiral conveying rod is horizontally arranged in the material pipe; the driving shaft of the second motor is connected to the central axis of the second spiral conveying rod, so as to drive the second spiral conveying rod to rotate and output the filter residue in the material pipe through its discharge end. The discharge end of the material pipe is provided with a feed barrel, one side of the feed barrel is connected to the material pipe, and its bottom end is connected to the circulating leaching slurry neutralization unit. A valve is provided in the feed barrel, and the valve is connected to the measuring module. When the measuring module detects that the pH value reaches the set value, the valve is closed.

[0014] In some embodiments, the measurement module includes a pH detector and a processor. The pH detector is arranged in the circulating leaching slurry neutralization unit to detect the pH value of the slurry in the circulating leaching slurry neutralization unit; the processor is electrically connected to the material guide drive and the pH detector. When the pH value detected by the pH detector is less than the set value of the processor, the material guide drive operates normally; when the pH value detected by the pH detector reaches the set value of the processor, the processor controls the material guide drive to stop operating.

[0015] Compared with the prior art, the beneficial effects of the present invention include: the treatment of the slag phase generated in the multi-stage iron removal aluminum chromium unit is achieved by setting the filtering module and the refinement module; the suction component is set in the slag phase precipitation area of ​​the multi-stage iron removal aluminum chromium unit, and the precipitate generated in the multi-stage iron removal aluminum chromium unit can be promptly extracted into the filtering component for filtration during the slurry treatment process; after solid-liquid separation by the filtering component, the filtrate is returned to the multi-stage iron removal aluminum chromium unit for reaction, and the filter residue is discharged to the refinement module; the large particles in the filter residue are crushed by the refinement module, so that the particle size of various substances in the filter residue is uniformly refined, which is conducive to the full reaction of the slag phase with the acidic slurry when the slag phase is reused later, thereby improving the efficiency of slag phase recycling;

[0016] Through the set feeding module and measuring module, the pH value of the slurry in the circulating leaching slurry neutralization unit is obtained through the measuring module. When the detected pH value reaches the set value, the material guide drive is controlled to stop feeding to the feeding circulating leaching slurry neutralization unit, and the amount is controlled by the returned filter residue to further improve the subsequent acid leaching dissolution efficiency of the slag phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of an embodiment of a slag phase treatment system for laterite nickel ore leachate after iron, aluminum and chromium removal provided by the present invention;

[0018] FIG2 is a schematic structural diagram of a filtration assembly of a slag phase treatment system for removing iron, aluminum, and chromium from the laterite nickel ore leachate in FIG1 ;

[0019] FIG3 is a schematic structural diagram of a suction assembly of a slag phase treatment system for removing iron, aluminum, and chromium from the laterite nickel ore leachate in FIG1 ;

[0020] FIG4 is a schematic structural diagram of a refinement module of a slag phase treatment system after iron, aluminum, and chromium removal from the laterite nickel ore leachate in FIG1 ;

[0021] FIG5 is a schematic structural diagram of a feed module of a slag phase treatment system after iron, aluminum and chromium removal from the laterite nickel ore leachate in FIG1 .

[0022] Figure: 1. Filtration module; 11. Suction assembly; 111. Suction pipe; 112. Suction pump; 113. First connecting pipe; 114. Second connecting pipe; 12. Filtration assembly; 121. Outer cylinder; 122. Inner cylinder; 123. Liquid collection tank; 124. First screw conveyor rod; 125. First motor; 126. Third connecting pipe; 2. Refining module; 21. Kettle body; 22. Crush assembly; 221. Crush roller; 23. Abrasive assembly; 231. Abrasive roller; 232. Third motor; 3. Feed module; 31. Feed pipe; 32. Material guide drive; 321. Second screw conveyor rod; 322. Second motor; 33. Feed barrel; 34. Valve; 4. Measuring module; 5. Feed valve; 6. Neutralization and impurity removal module; 61. Circulating leaching slurry neutralization unit; 62. Multi-stage countercurrent washing unit; 63. Multi-stage iron, aluminum and chromium removal unit. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Before describing the embodiments, the present invention first explains some of the terms in the text;

[0025] In the description of this application, "electrical connection" primarily refers to a connection method that enables data exchange, including a physical direct connection via a cable and a wireless connection. The specific connection methods are well-known technologies that can be understood and considered by those skilled in the art, and will not be further explained herein.

[0026] In the description of the present application, “plurality” means two or more, unless otherwise clearly defined.

[0027] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] As shown in FIG1 to FIG5 , the present invention provides a slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leachate, comprising a filtering module 1 , a refinement module 2 , a feeding module 3 and a measurement module 4 .

[0029] The filter module 1 includes a suction component 11 and a filter component 12. The suction component 11 is used to be set in the slag phase precipitation area in the multi-stage iron removal aluminum chromium unit 63 and its suction port is connected to the slag phase precipitation area, and is used to extract the slag phase generated in the multi-stage iron removal aluminum chromium unit 63. The filter component 12 is connected to the discharge port of the suction component 11 and is used to filter the slag phase. The filter component 12 has a filter residue outlet and a filtrate outlet connected to the multi-stage iron removal aluminum chromium unit 63.

[0030] The refinement module 2 is connected to the filter residue outlet and is used to crush the filter residue.

[0031] The feed module 3 includes a feed pipe 31 and a material guide drive 32. The feed pipe 31 has a feed end connected to the discharge port of the refinement module 2, and a discharge end for communicating with the circulating leaching slurry neutralization unit 61. The material guide drive 32 is built into the feed pipe 31 and is used to guide the slag phase into the circulating leaching slurry neutralization unit 61.

[0032] The measuring module 4 is connected to the material guide drive 32 and the circulating leaching slurry neutralization unit 61, and is used to obtain the pH value of the slurry in the circulating leaching slurry neutralization unit 61, and control the material guide drive 32 to stop feeding when the detected pH value reaches a set value.

[0033] In this device, after the slag phase generated in the multi-stage iron removal, aluminum and chromium unit 63 is sucked out by the suction component 11, the slag phase can be introduced into the filter component 12. After solid-liquid separation by filtration of the filter component 12, the sucked filtrate can be returned to the multi-stage iron removal, aluminum and chromium unit 63, and the filter residue is discharged to the refinement module 2. After being crushed by the refinement module 2, it is introduced into the material pipe 31, and the slag phase is sequentially guided into the circulating leaching slurry neutralization unit 61 by the drive of the material guide drive 32. When the measuring module 4 detects that the pH value of the slurry in the circulating leaching slurry neutralization unit 61 reaches the set value, the measuring module 4 can trigger a signal to control the material guide drive 32 to stop feeding, and the amount of slag phase input can be regulated according to the pH value of the slurry in the circulating leaching slurry neutralization unit 61.

[0034] It should be noted that the iron, aluminum and chromium removal part of the laterite nickel ore leachate specifically includes a neutralization and impurity removal module 6, which includes a circulating leaching slurry neutralization unit 61, a multi-stage countercurrent washing unit 62 and a multi-stage iron, aluminum and chromium removal unit 63. The circulating leaching slurry neutralization unit 61 is used to neutralize excess acid in the leachate. The multi-stage countercurrent washing unit 62 is connected to the circulating leaching slurry neutralization unit 61 to wash the neutralized leachate. The multi-stage iron, aluminum and chromium removal unit 63 is connected to the multi-stage countercurrent washing unit 62 to remove impurities from the liquid phase of the leachate after washing by the multi-stage countercurrent washing unit 62. The slag removal method is to add a neutralizer thereto to gradually increase the pH value.

[0035] The multi-stage iron removal aluminum chromium unit 63 includes multiple sequentially connected iron removal aluminum chromium subunits. The pH value of the impurity removal gradually increases in each iron removal aluminum chromium subunit, that is, the pH value of the first iron removal aluminum chromium subunit is the lowest. Experimental testing shows that the slag phase produced by the first iron removal aluminum chromium subunit mainly contains iron, aluminum, and chromium, and contains very little nickel, cobalt, and manganese. Therefore, the slag phase produced by the first iron removal aluminum chromium subunit can be discarded as tailings. The slag phase produced by the other iron removal aluminum chromium subunits contains iron, aluminum, nickel, and cobalt, including non-negligible nickel, chromium, and manganese. This slag phase can be introduced into the circulating leaching slurry neutralization unit 61 for acid leaching and dissolution.

[0036] Therefore, this device mainly processes the slag phase produced after a stage of iron removal, aluminum chromium sub-unit, that is, the subsequent multi-stage iron removal, aluminum chromium sub-unit. Correspondingly, according to the multi-stage iron removal, aluminum chromium sub-unit 63 including multiple stages of iron removal, aluminum chromium sub-units connected in sequence, there are multiple suction components 11, which are respectively arranged in the iron removal, aluminum chromium sub-unit after one stage.

[0037] In some embodiments, as shown in Figure 3, the suction component 11 includes a suction pipe 111 and a suction pump 112. The suction pipe 111 is arranged in the slag phase precipitation area in the multi-stage iron removal aluminum chromium unit 63, that is, it is arranged in the equipment of the multi-stage iron removal aluminum chromium sub-unit after one stage. The suction pipe 111 is placed at the bottom of the equipment, and its lower side is evenly provided with multiple suction ports connected to the interior of the equipment along its length; the inlet of the suction pump 112 is connected to the suction pipe 111 through the first connecting pipe 113, and its outlet is connected to the inner tube 122 of the filter component 12 through the second connecting pipe 114. When in use, the suction pump 112 is turned on, and the slag phase precipitated at the bottom of the equipment of the multi-stage iron removal aluminum chromium sub-unit can be sucked out through the first connecting pipe 113 and the suction port of the suction pipe 111, and sent to the filter component 12 through the second connecting pipe 114.

[0038] In some embodiments, as shown in FIG2 , one or more filter components 12 are provided. When one filter component 12 is provided, it is connected to the discharge ports of multiple suction components 11. When multiple filter components 12 are provided, each filter component 12 is connected to the suction component 11 in a one-to-one correspondence, and can respectively realize comprehensive treatment or classified treatment of slag phases generated in multiple sections. The filter component 12 includes an outer cylinder 121, an inner cylinder 122, a liquid collecting box 123, a first spiral conveying rod 124 and a first motor 125. The outer cylinder 121 is tilted; the inner cylinder 122 is built into the outer cylinder 121 and is coaxially arranged with the outer cylinder 121. A number of filter holes for filtering liquids are evenly opened on the wall of the inner cylinder 122, so that the liquid substances contained in the inner cylinder 122 can be filtered through the filter holes to the interlayer between the inner cylinder 122 and the outer cylinder 121, and the inner cylinder 122 is relatively thick. The lower end is connected to the discharge port of the suction component 11, that is, it is connected to one end of the second connecting pipe 114. The material residue extracted by the suction component 11 will be sent to the bottom end of the inner cylinder 122, and the higher end of the inner cylinder 122 is connected to the refinement module 2; the collecting tank 123 is sleeved on the lower end of the outer cylinder 121. After the material residue is filtered through the filter holes and flows to the interlayer between the inner cylinder 122 and the outer cylinder 121, it is converged into the collecting tank 123 through a through port opened on the bottom side of the outer cylinder 121 and connected to the collecting tank 123. The first spiral conveying rod 124 is built into the inner cylinder 122 and is rotatably connected to the inner cylinder 122, and the driving shaft of the first motor 125 is connected to the first spiral conveying rod, so that the first motor 125 can drive the bolt rod conveying rod to rotate inside the inner cylinder 122. The first spiral conveying rod 124 extends from the bottom end of the inner cylinder 122 to the top end thereof. During its rotation, it can transport the material box at the bottom end of the inner cylinder 122 to the top end of the inner cylinder 122 so as to transport the filter residue to the refinement module 2. At the same time, it can also stir the filter residue during the transportation process so as to fully filter the liquid mixed in the filter residue.

[0039] Furthermore, the bottom end of the liquid collecting tank 123 is connected to a third connecting pipe 126, which is connected to a water pump through the third connecting pipe 126 and connected to the multi-stage iron removal, aluminum and chromium removal unit 63. The water pump can return the filtrate collected in the liquid collecting tank 123 to the multi-stage iron removal, aluminum and chromium removal unit 63 to continue the impurity removal process.

[0040] Furthermore, as shown in FIG1 , in some embodiments, a feed valve 5 is provided between the filter residue outlet of the filter assembly 12 and the refinement module 2. By closing the feed valve 5, the feed to the refinement module 2 can be stopped in time to avoid blockage caused by excessive material supply in the refinement module 2.

[0041] As shown in Figures 1 and 4, in some embodiments, in order to ensure the fineness of the slag, the refining module 2 includes a kettle body 21, a crushing component 22 and an abrasive component 23 arranged in sequence below the feed port of the kettle body 21. The crushing component 22 is used to crush the filter residue entering the feed port, and the abrasive component 23 is used to grind the crushed filter residue. By performing the crushing and grinding processes, a finer slag can be obtained.

[0042] Furthermore, the crushing assembly 22 includes two crushing rollers 221 and a driving member. The two crushing rollers 221 are arranged in parallel and are meshed and connected to each other for rotation. Both ends of the crushing rollers 221 are connected to the kettle body 21 for rotation. A crushing area corresponding to the feed port of the kettle body 21 and used to crush the filter residue is formed between the two crushing rollers 221; the driving member is preferably two motors, which are respectively connected to the two crushing rollers 221 and can drive the two crushing rollers 221 to rotate relative to each other, so that the material can be crushed and crushed by the two crushing rollers 221 after entering the crushing area between the two crushing rollers 221.

[0043] Furthermore, the middle part of the outer wall of the kettle body 21 is recessed inward to form an inward-contracted cylinder, which is located between the crushing assembly 22 and the abrasive assembly 23. The upper end of the inward-contracted cylinder is connected to the inner wall of the kettle body 21 to form a contraction channel with a cross-sectional area decreasing from top to bottom, so that the material crushed by the crushing assembly 22 can be concentrated to the inward-contracted cylinder. The lower end of the inward-contracted cylinder is connected to the inner wall of the kettle body 21 to form an expansion channel with a cross-sectional area increasing from top to bottom; the abrasive assembly 23 includes a grinding roller 231 and a third motor. 232, the grinding roller 231 is built into the expansion channel, and the outer peripheral surface of the grinding roller 231 is spaced from the inner wall of the kettle body 21 so as to form a grinding zone therebetween. After the material enters the inward-contracted cylinder, it will be discharged into the grinding zone. The width of the grinding zone decreases from top to bottom. The driving shaft of the third motor 232 is eccentrically connected to the grinding roller 231, so that when the third motor 232 drives the grinding roller 231 to rotate, the grinding roller 231 can intermittently contact the inner wall of the kettle body 21 to extrude the material, thereby achieving grinding of the slag.

[0044] As shown in Figures 1 and 5, in some embodiments, the discharge port of the material pipe 31 can be directly connected to the circulating leaching slurry neutralization unit 61, and the feed port of the material pipe 31 is set at the end away from the discharge port. The material guide drive member 32 includes a second spiral conveying rod 321 and a second motor 322. The second spiral conveying rod 321 is horizontally arranged in the material pipe 31; the driving shaft of the second motor 322 is fixedly connected to the central axis of the second spiral conveying rod 321, so that when the second motor 322 drives the second spiral conveying rod 321 to rotate, the material entering the inlet of the material pipe 31 can be conveyed to its discharge port, thereby realizing the discharge of the filter residue to the circulating leaching slurry neutralization unit 61.

[0045] Furthermore, when the measuring module 4 drives the material guide drive 32 to stop, the speed of the second motor 322 will gradually slow down until it stops. Therefore, during the process of the second motor 322 being turned off, it will still drive the spiral conveying rod to rotate slowly to discharge the material. In order to prevent the material guide drive 32 from excessively conveying filter residue to the circulating leaching slurry neutralization unit 61, in some embodiments, a feed barrel 33 is provided at the discharge end of the material pipe 31, one side of the feed barrel 33 is connected to the material pipe 31, and its bottom end is connected to the circulating leaching slurry neutralization unit 61. A valve 34 is provided in the feed barrel 33, so that when the material guide drive 32 stops, the material will be introduced into the feed barrel 33, and the valve 34 is connected to the measuring module 4. When the measuring module 4 detects that the pH value reaches the set value, the valve 34 is closed to retain the material in the feed barrel 33.

[0046] In some embodiments, the measuring module 4 includes a pH detector and a processor. The pH detector is arranged in the circulating leaching slurry neutralization unit 61 to detect the pH value of the slurry in the circulating leaching slurry neutralization unit 61; the processor is electrically connected to the second motor 322 of the material guide drive 32 and the pH detector. When the pH value detected by the pH detector is less than the set value of the processor, the second motor 322 operates normally and drives the second spiral conveying rod 321 to rotate for feeding; when the pH value detected by the pH detector reaches the set value of the processor, the processor controls the second motor 322 to stop running.

[0047] Working principle: After the slag phase is generated in the multi-stage iron removal aluminum chromium unit 63, the suction pump 112 is turned on to suck the slag phase generated in the multi-stage iron removal aluminum chromium unit 63 out of the inner cylinder 122 through the first connecting pipe 113 and the second connecting pipe 114, and the first motor 125 drives the first spiral conveying rod 124 to rotate and convey the filter residue to the kettle body 21. During the conveying, the filtrate is filtered in the inner cylinder 122 to the interlayer between the inner cylinder 122 and the outer cylinder 121, and flows along the outer cylinder 121 to the liquid collecting tank 123. The filtrate in the liquid collecting tank 123 is sent back to the multi-stage iron removal through the water pump and the third connecting pipe 126. The iron, aluminum and chromium unit 63, after the filter residue is fed into the kettle body 21, it is crushed by the crushing area between the two crushing rollers 221, and then ground and refined again in the grinding area before being introduced into the material pipe 31. The second motor 322 drives the second spiral conveying rod 321 to rotate and the slag phase is sequentially discharged into the circulating leaching slurry neutralization unit 61. When the pH value detector detects that the pH value of the slurry in the circulating leaching slurry neutralization unit 61 reaches the set value of the processor, the processor can trigger a signal to control the second motor 322 to stop, thereby stopping feeding to the circulating leaching slurry neutralization unit 61.

[0048] The present invention realizes the treatment of the slag phase generated in the multi-stage iron removal aluminum chromium unit 63 by providing the filtering module 1 and the refining module 2. The suction component 11 is provided in the slag phase precipitation area of ​​the multi-stage iron removal aluminum chromium unit 63. During the slurry treatment process, the precipitate generated in the multi-stage iron removal aluminum chromium unit 63 can be promptly extracted to the filtering component 12 for filtration. After solid-liquid separation by the filtering component 12, the filtrate is returned to the multi-stage iron removal aluminum chromium unit 63 for reaction, and the filter residue is discharged to the refining module 2. The large particles in the filter residue are crushed by the refining module 2, so that the particle size of various substances in the filter residue is uniformly refined. When the slag phase is reused later, it is conducive to the full reaction of the slag phase with the acidic slurry, thereby improving the efficiency of slag phase recycling.

[0049] The present invention provides a feeding module 3 and a measuring module 4, and obtains the pH value of the slurry in the circulating leaching slurry neutralization unit 61 through the measuring module 4. When the detected pH value reaches the set value, the material guide drive 32 is controlled to stop feeding the feeding circulating leaching slurry neutralization unit 61, and the amount of the returned filter residue is controlled to further improve the subsequent acid leaching dissolution efficiency of the slag phase.

[0050] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution, characterized in that: include: A filter module, the filter module comprising a suction component and a filter component, the suction component is used to be arranged in a slag phase precipitation zone in a multi-stage iron removal aluminum chromium unit and its suction port is connected to the slag phase precipitation zone, and is used to extract the slag phase generated in the multi-stage iron removal aluminum chromium unit, the filter component is connected to the discharge port of the suction component, and is used to filter the slag phase, and the filter component has a filter residue outlet and a filtrate outlet connected to the multi-stage iron removal aluminum chromium unit; A refinement module, the refinement module is connected to the filter residue outlet and is used for crushing the filter residue; as well as A feed module, the feed module includes a feed pipe and a material guide drive, the feed pipe has a feed end connected to the discharge port of the refinement module, and a discharge end for communicating with the circulating leaching slurry neutralization unit, the material guide drive is built into the feed pipe, and is used to guide the slag phase into the circulating leaching slurry neutralization unit.

2. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 1 is characterized in that: The suction assembly comprises: A suction pipe, the suction pipe is arranged in the slag phase precipitation area in the multi-stage iron removal, aluminum and chromium removal unit, and a plurality of suction ports are evenly arranged on the lower side thereof along the length direction thereof; and A suction pump, wherein the inlet of the suction pump is connected to the suction pipe through a first connecting pipe, and the outlet of the suction pump is connected to the filter assembly through a second connecting pipe.

3. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 1 or 2, characterized in that: The filter assembly comprises: An outer cylinder, wherein the outer cylinder is arranged obliquely; An inner cylinder, the inner cylinder is built into the outer cylinder and is coaxially arranged with the outer cylinder, a plurality of filter holes for filtering liquid are evenly opened on the cylinder wall of the inner cylinder, the lower end of the inner cylinder is connected to the discharge port of the suction component, and the higher end thereof is connected to the thinning module; A liquid collecting box, the liquid collecting box is sleeved on the lower end of the outer cylinder, and a through opening communicating with the liquid collecting box is provided on the bottom side of the outer cylinder; a first spiral conveying rod, which is built into the inner cylinder and extends from the bottom end of the inner cylinder to the top end thereof; and A first motor, wherein a driving shaft of the first motor is connected to the first screw conveying rod, and is used to drive the first screw conveying rod to rotate so as to convey the filter residue to the refinement module.

4. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 1, characterized in that: The refinement module comprises a kettle body, a crushing assembly and an abrasive assembly which are sequentially arranged below a feed port of the kettle body, wherein the crushing assembly is used for crushing filter residue entering through the feed port, and the abrasive assembly is used for grinding the crushed filter residue.

5. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 4 is characterized in that: The material breaking component comprises: Two crushing rollers, which are arranged in parallel and mesh with each other for rotation, and a crushing area corresponding to the feed inlet of the kettle body and used for crushing the filter residue is formed between the two crushing rollers; A driving member is connected to the two breaking rollers to drive the two breaking rollers to rotate relative to each other.

6. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 4, characterized in that: The middle part of the outer wall of the kettle body is concave inward to form an inwardly contracted cylinder body, the inwardly contracted cylinder body is located between the material breaking assembly and the abrasive assembly, the upper end of the inwardly contracted cylinder body is connected to the inner wall of the kettle body to form a contraction channel whose cross-sectional area decreases from top to bottom, and the lower end of the inwardly contracted cylinder body is connected to the inner wall of the kettle body to form an expansion channel whose cross-sectional area increases from top to bottom; The abrasive assembly includes a grinding roller and a third motor. The grinding roller is built into the expansion channel. The outer peripheral surface of the grinding roller and the inner wall of the kettle body are spaced apart to form a grinding zone therebetween. The driving shaft of the third motor is connected to the grinding roller to drive the grinding roller to rotate so as to grind the filter residue passing through the grinding zone.

7. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 1, characterized in that: The material guide driving member comprises: A second spiral conveying rod, the second spiral conveying rod is horizontally arranged in the material pipe; and A second motor, wherein the driving shaft of the second motor is connected to the central axis of the second screw conveying rod, is used to drive the second screw conveying rod to rotate so as to output the filter residue in the conveying pipe through its discharge end.

8. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 7, characterized in that: A feeding barrel is provided at the discharge end of the material pipe, one side of the feeding barrel is connected with the material pipe, and the bottom end thereof is connected with the circulating leaching slurry neutralization unit. A valve is provided in the feeding barrel, and the valve is connected with the measuring module. When the measuring module detects that the pH value reaches the set value, the valve is closed.

9. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 1, characterized in that: The slag phase treatment system after iron, aluminum and chromium removal from the laterite nickel ore leachate also includes a measuring module, which is connected to the material guide drive and the circulating leaching slurry neutralization unit, and is used to obtain the pH value of the slurry in the circulating leaching slurry neutralization unit, and control the material guide drive to stop feeding when the detected pH value reaches a set value.

10. The slag phase treatment system after iron, aluminum and chromium removal from laterite nickel ore leaching solution according to claim 9, characterized in that: The measurement module comprises: a pH value detector, which is disposed in the circulating leaching slurry neutralization unit and is used to detect the pH value of the slurry in the circulating leaching slurry neutralization unit; and The processor is electrically connected to the material guiding drive and the pH value detector. When the pH value detected by the pH value detector is less than the set value of the processor, the material guiding drive operates normally; when the pH value detected by the pH value detector reaches the set value of the processor, the processor controls the material guiding drive to stop operating.

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